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Eliot Moss wrote:
On 9/23/2014 8:47 AM, Paulo CÃsar Pereira de Andrade wrote:Hi, I am almost done porting https://savannah.gnu.org/projects/lightningto cygwin and windows64 abi. But I found a problem with the ffs function.The test case is simple: $ cat x.c extern int ffs(int); int main(void) { long l = 0x80000000; int i = ffs((int)l); return 0; } $ gcc -O0 -g3 x.c $ ./a.exe Segmentation fault (...)WJFFM in 32 bit cygwin.
It fails under 64 bit cygwin. This segfaults if gcc -fno-builtin option is used: ffs(0x80000000) These work: ffs(0xc0000000) ffs(0x40000000)Likely a subtle problem in table based ffs() implementation in winsup/cygwin/syscalls.cc if only upper bit is set. The newlib version of ffs() works.
Christian -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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